Not at all surprised where it's concentrated though. The poorest, least educated, least healthful States in the country, where corporate branding has superceded basic terminology.

Would you like a Coke?

hands you an orange crush

Have you ever asked for a root beer and been given a Dr pepper?

I'll never forget my horror when I asked for a medium coke and the lady just handed me some random beverage. She didn't even ask what kind of coke I wanted.

Though nowadays the only coke I drink is la croix.

It's not all that different from Kleenex, Scotch tape, Xerox, etc. Sometimes brand names become the common name for a product.